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Hi Dave, The bottom thermostat is linked to the Electric Immersion heater, the top one is linked to the Boiler system. I'm looking at the wiring diagrams to see how i can test for call at the boiler side. I've almost replaced half the system.. perhaps should have just called a sparky.. :(

New Actuator fitted..but still nothing... thermostat is clicking but no call is being generated... any more ideas??

Thanks Dave, Would the actuator be faulty considering it works ok with the CH?. Cheers

thanks... i had a feeling it was the actuator but couldn't figure out how to test it. It works ok with the CH though would that be right enough?. Also, may seem a real silly question, but the system doesn't need the CH on to run the HW does is?. they should both work independently?.

Hi, Our hot water system is not working. I've a Potterton suprima 40 boiler, Drayton LP522 programme unit, 2 x Apcom WH9 thermostats on the hot water tank and a drayton actuator. I recently replaced the pcb on the boiler has i had the common lock out problem. This cured that issue, the new...